High-pressure centrifugal pump.



v H. J. SCHWADE.

HIGH PRESSURE GENTRIPUGAL PUMP.

APPLIOATION FILED SEPT. s. 1909.

@ATENT @FElQEt HANS JAMES SCHWADE, OF ERFURT, GERMAN.

HIGH-PRESSURE CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Jan. 3, 1911,

Application filed September 8, 1909. Serial No. 516,709.

behin another on the same spindle. In' such constructions there is moreor less axial thrust on the pump spindle acting in the direction towardthe suction side. Constructions are known for taking up or neutralizingthis'axial thrust partly with and partly Without the use of a thrustbearing. The two well known methods of neutralizing are known as Jaegersconstruction and Sulzers construction. fThe Jaeger construction uses apacking ring behind each rotating wheel 'for neutralizing, andperforations in the Wall of the rotating wheel, also a thrust bearingfor taking up the remainder or" the axial thrust. Sulzers constructionconsists of a relief disk mounted behind the last wheel on the dischargeside, exposed onone side to the whole pres sure of the last wheel,.while on the other side it is in communication withthe atmosphere.

The automatically acting axial pressure regulator according tothisinvention is, on the contrary, characterized by the relief disk, or therelief piston, beine* exposed on one side to the full pressure of thelast rotating wheeh'while on the other side it is in directcommunication with a vacuum, for which reason itv is preferably mountedin the suction bend in front of the first wheel, This relief device actsin such manner that the high pressure water of the relief device,

at the moment when the spindle is being thrust toward the dischargebranch, is in direct communication with the vacuum by meansfof achannel,l whereby the high pressure on the relief device is reduced, butthe spindle is again at once automatically pushed to this side, and thechannel again reduced, and inthat way the axial pressure isY completelyneutralized by means of automatic oscillations `ofthe spindle of almostintlnitely small amplitude without the use of a thrust bearing.Moreover, in the present invention the pressure water seal of thesuction stuling box can be combined with the axial pressure regulator inquestion; that is to say, no separatewater seal will be necessary. Theautomatic` axial pressure regulator according to this invention has thefurther advantage that a throttle valve or cock may be mounted ifrequired in the connection conduit between the relief disk and the highpressure or discharge branch of the pump, by means of which throttle afurther regulation of the water pressure can be effected wit-hout itbeing `necessary to dismount any portion' of the pump. When the watercontains sand .or other impurities, it is possible, for the purposeof-protecting the relief device, to mount a filter 1n the saidconnection-between the pressure or discharge branch and thereliefdevice. The automatically acting axial pressure regulatoraccording to this invention differs therefore from known axialpressureregulators chiefly by the fact that its relief disk is incommunication on one side with the high pressure or discharge branchbehind the last wheel, and on the other side with the Vvacuum chamber,all perforations of the rotating wheell walls and allpacking ringsbehind the larger rotating wheel walls being at the same timeunnecessary. A A construction of the relief deviceaccording to thisinvention is illustrated by way of example in the accompanying vdrawingin which-" a is the relief disk or pisto jb the high pressure chamber ofthe .relief evice which is in communication with the dischargel brancho, and thus, indirectly, with the high pressure chamber Z behind thelast rotating wheel, by means of the conduit or pipe e. The filter f andthe throttle valve g are also diagrammatically indicated. l The vacuumor suctionv chamber It is in open communication with the conductingchamber z' behind the relief device a, so that on that side of thevrelief device there is always a vacuum. The single rotating Wheels haveno perforations and there are no packing rings on the back at 7c.

What I claim is: H y

In a high pressure centrifugal pump, the combination, with a spindleand-a plurality of wheels mounted thereon; of a casingwherein saidwheels are disposed provided with a pair of interiorly-located spaced'walls Mil-uh producing a chamber therebetween, the real tion Chamber,and its front face spaced from will being formed with an openinfrleading the front Wall of said chamber to provide :i into the suctionchamber in front o? the first channel leading to the smid conduitlWheel, andthe front Wall with an opening In testimony whereof I havehereunto set 5 in communication with the exit side of the my hand inpresence of two'subsclibing Wit- 15 pump behind the last Wheel; and arelief messes.

disk secured to said spindle Within the first- HANS JAMES SCHVVADE.named chamber, said disk having its rear f l Witnesses: face spaced fromthe rear Wall of said cham- ERNST EBERHARDT,

i0 bei" to pmvide a conduit leading to 'the suc- HANS SGHNUCK.

